Rotary pumping apparatus



Nov. '28, 1939. A. c, WHITTOME ET Al. 2,181,677

ROTARY PUMPING APPARATUS Filed Aug. 7, 1937 INVENTORS A'.C.WHITTOME 0. BOARDMAN y o centrifugal pump and its driving motor in a very and bolts I5. In each slot of the laminations there UNITED STATES PATENT OFFICE ROTARY PUMPING APPARATUS Arthur Cyrus Whittome, Johannesburg, Transvaal, and Cebert Boardman, Springs, Transvaal, Union of South Africa, assignors to A. C. Whittome (Proprietary) Limited, Johannesburg, Transvaal, Union of South Africa, a.

company of the Union of South Africa Application August '2, 1937, Serial No. 157,962 In the Union of South Africa September 26, 1936 4 Claims. (Cl. 103-87) The present invention relates to pumping ap- The cylinder 3 is provided with a lamination paratus comprising a centrifugal pump and a seating II and the flange 12, said two parts supmotor for driving such pump. porting the laminations l3 of the rotor which are One object of the invention is to provide a held in position by means of the end cheek l4 compact form. Another object of the invention is arranged a single conductor I6 which is lightly is to provide a pumping apparatus in which the insulated from the laminations 13, all of said confluid moved by the pump increases the efiiciency ductors being short-circuited at their ends by of the motor in case an electric motor is used. means of the rings IT. The whole structure rep- 10 According to the invention a pumping apparesents a squirrel cage rotor the shaft of which 10 ratus comprises a centrifugal pump of the kind is formed by the rotating casing 2. comprising a rotating casing with an axial inlet The stator of the motor comprises the outer and outlet, and a driving motor the rotor parts casing l0 provided with the flange 18, the laminaof which are mounted on the casing so that said tions l9 secured to the casing by the end cheek casing forms the shaft of the rotor. and the bolts 2| engaging the flange l8, wind- 15 According also to the invention a pumping apings 22 provided in the slots of the laminations paratus comprises a centrifugal pump of the kind l9, means for connecting said windings to an in which the casing is internally formed as a outer circuit (not shown) and the two end shields centrifugal impeller which causes the fluid to 23, 24 bolted to the outer casing. The end shields 20 diverge therein from the axial inlet and to be are provided with openings 25 the diameter of discharged therefrom at a distance from the imwhich is greater than the diameter of the plates peller axis and in the direction of said axis, means 4 and 5. being provided to receive the fluid from the im- The outer casing I0 is bolted to the base plate peller and to cause said fluid to be discharged 26. The hollow shafts 8 and 9 are supported in 25 from the axial outlet, and a driving motor, of bearings 21,21. The shaft 8 enters a fixed con- 25 which the rotor parts are mounted on the casduit 28 fitted with a stuffing box 2%. The shaft ing, said casing forming the shaft of the rotor. 9 similarly enters a fixed conduit 30 fitted with In the preferred embodiment of the invention a stumng box 3|. The bearings 21, 2'! and the the motor is an electric motor, the rotor windings fixed conduits 28, 30 are supported by pillars 30 of which preferably are short circuited and have 32, 32 and 33, 33 flan at their lower s 30 no connection to another circuit, Said ends 3d are fixed to the base plate 2-5 by According further to the invention the rotating the bolts 35. The base plate 26 is provided with casing of a pumping apparatus of the aforesaid guiding members 36, 36 fitting into corresponding kind is so constructed and arranged that all parts recesses Of the pillars and y Which the pillars 35 within said casing which are exposed to the 3 are kept parallel to the axis of the pump when deteriorating action of the fluid are replaceable m ved r the P p Of replacing e a ed and can be readily replaced Without dismantling parts. the rotor parts, means being provided for easily The bearings o e Sha ts 8 nd 9 of the centralizing the rotating casing with respect to r ta in s n pp g h rotor p r f h 40 the stator of the driving motor after such remotor bei supported y h same b plate 40 placement, 7 which also supports the outer casing of the The bearings for the rotatingcasing are supstator, rotor and stator are kept in their co-axial ported by a frame which also supports the stator position with respect to each other. The rotatof the motor in its proper axial position. ing casing and the stator being mounted on the One form of the invention is shown in the acsame base plate the driving forces are well balcompanying drawing in part sectioned elevation, anced which is otherwise very difficult to be In the drawing, 2 indicates the rotating casachieved with pumping apparatus comprising a ing comprising a cylinder 3, two end plates 4 and rotating casing of the above described kind.

5 secured to the cylinder by bolts 6 and the hol- The impeller l is positioned in the left hand low shafts 8 and 9 bolted to the plates 4 and 5 end of the barrel 3 and is secured to the plate I 0 respectively. 4, as by screw bolts 31. It comprises a part 38 In the shown form of the invention an elecwhich. defines the outer walls 39 of the impeller tric motor is used and its rotor parts are mounted passages 49, a co-axial boss 4! which defines the on the part of the rotating casing forming the inner Walls of the passages, and vanes d2 concylinder. necting the parts 38 and M. In the shown em- 55 bodiment of the invention the parts 38, ll and 42 form one integral structure. An impeller of this kind, the single parts of which are rigidly connected to one another, so as to form a single unit which can be fixed to the cylinder as a whole will be termed an impeller unit. Each impeller passage extends from the inlet passage 53 in the hollow shaft 8 in a double curve which starts 1 axially, diverges from the axis, and terminates parallel to the axis at a discharge mouth 5 distant from the axis.

Vanes 45 may be provided on the inner surface of the rotating inlet passage 43, and have the effect of imparting an initial rotation to the fluid passing through said passage before it enters the impeller proper.

56 indicates a funnel which is adapted to receive the liquid from the discharge mouths 44. The funnel 46 converges towards an axial outlet passage 5? which is defined by the tubular extension 38 of said funnel, said extension being secured, e. g., screwed, in a part of the fixed conduit 3i]. Secured in this manner, the funnel 46 is stationary and retards the rotation, about the axis, of liquid discharged from the mouths i into the funnel. Such rotation of the liquid is further diminished by vanes 49 which are fixed in the funnel 6 to extend inwardly thereof. A conoidal formation 50 defined by an inner wall fills the space 52 on the outlet side of the impeller and prevents eddying of liquid in said space. The inner wall 5| is, in the case shown,

supported co-axially within the funnel 46 by the vanes 9, and in conjunction with the funnel forms an annular passage 53 with an annular receiving mouth 53 which registers with the imieller discharge mouths 44. Fluid receiving means of this kind, the inner parts of which are fixed to and are supported by an outer member, will be termed the fluid receiving unit.

In operation, upon the cylinder being rotated, fluid in the passages 40 is acted upon by the vanes '32 and centrifugally driven to the discharge mouths id. The fluid is discharged into the annular passage 53 wherein its rotational movement is diminished with consequent decrease of its centrifugal action. This enables the fluid to converge in the passage 53 and to be displaced along said passage by the incoming fluid to the axis and to the outlet passage 4i.

With the electric motor elements mounted on the casing as above described, cold fluid passing through the casing withdraws heat generated by said elements, thus increasing the efliciency of the motor.

The impeller unit and the fluid receiving unit can be replaced as follows: The bolts 6 securing the end plate 5 and the bolts 35 fastening the right hand pillar end 3d are drawn back and the pillars 33, 323 with all parts attached to and supported by them are moved along the guiding nember 323 to the right until the fluid receiving unit is well out of the cylinder 3. The screws 37 are removed, the impeller unit is taken out of the cylinder 3 and replaced by a new one which in turn is fixed by screws M to the end plate 4. The fluid receiving unit is screwed out of the fixed conduit 33 and a new one is screwed in instead. Thereupon'the pillar 33, 33 is moved along the guiding member 36 into its operating position and the bolts 35 and 3! are fastened.

We claim:

1. A centrifugal rotary pumping apparatus comprising fixed co-axial inlet and outlet conduits, a hollow rotatable member co-axial with and connecting said conduits, said hollow member comprising an impeller casing formed as a cylinder, an impeller unit arranged within and replaceably fixed to the cylinder, means for closing one end of the cylinder, a removable end plate fixed to and closing the other end of the cylinder, electric motor rotor parts mounted externally on said cylinder to rotate therewith and a stationary outer casing surrounding said cylinder and having mounted thereon motor stator parts cooperating with said rotor parts to form an operative electric motor therewith; said outer casing being formed at the side adjacent said end plate with an opening permitting the removal of said end plate; and axially displaceable supporting means for said end plate permitting said end plate to be displaced without displacement of i said cylinder.

2. A centrifugal rotary pumping apparatus comprising fixed co-axial inlet and outlet conduits, ahollow rotatable member co-axial with and connecting said conduits, said hollow member comprising an impeller casing formed as a cylinder, a replaceable impeller unit arranged within the cylinder and fixed to the inlet side thereof, a plate closing the inlet side of the cyline der, a removable end plate fixed to and closing the side of the cylinder opposite said impeller, and electrical motor rotor parts mounted externally on said cylinder to rotate therewith; a replaceable fluid receiving unit fixed to said out let conduit and projecting into said cylinder, through an aperture in said end plate; a stationary outer casing surrounding said cylinder and having mounted thereon electric motor stator parts co-operating with said rotor parts to form an operative electric motor therewith; said outer casing being formed at the side adjacent said end plate with an opening permitting the removal of said end plate; and axially displaceable supporting means for said end plate and said fluid receiving unit permitting said plate and said unit to be displaced without displacement of said cylinder.

3. A centrifugal rotary pumping apparatus comprising fixed co-axial inlet and outlet conduits, a hollow rotatable member co-axial with and connecting said conduits, said hollow member comprising an impeller casing formed as a cylinder, an impeller unit arranged within. and replaceably fixed to the cylinder; said impeller having an inlet opening, discharge mouths and a plurality of substantially equal passages separated by vanes and extending wholly within said impeller; each such impeller passage extending I from said inlet opening in a double curve and terminating parallel with the cylinder axis at one of said discharge mouths; means for closing one end of the cylinder; a removable end plate fixed to and closing the other end of the cylinder, electrical motor rotor parts mounted externally on said cylinder to rotate therewith and a stationary. outer casing surrounding said cylinder and and connecting said conduits, said rotatable member comprising an impeller casing formed as a cylinder, an impeller unit arranged within the cylinder and replaceably fixed to the inlet side thereof, said impeller having an inlet opening, discharge mouths and a plurality of substantially equal passages separated by vanes and extending Wholly within said impeller; each such impeller passage extending from said inlet opening in a double curve and terminating parallel with the cylinder axis at one of said discharge mouths; means for closing the end of the cylinder adjacent to the impeller; a removable end plate fixed 'to and closing the side of the cylinder opposite said impeller, and electrical motor rotor parts mounted externally on said cylinder to rotate therewith; a replaceable fluid receiving unit fixed to said outlet conduit and projecting into said cylinder through an aperture in said end plate; a stationary outer casing surrounding said cylinder and having mounted thereon electric motor stator parts co-operating with said rotor parts to form an operative electric motor therewith; said outer casing being formed at the side adjacent said end plate with an opening perting the removal of said end plate; and axy displaceaole supporting means for said end -e and said fluid receiving unit permitting said plate and said unit to be displaced without displacement of said cylinder.

CEBERT BOARDMAN. ARTHUR CYRUS WHITTOME. 

